[AK4958]
Unit
Parameter
min
typ
max
Video Signal Input
External Resistor (Note 20) R1 (Figure 3)
0.075
0.02
-
-
-
1.6
0.2
-
k
F
Vpp
External Capacitor
C1 (Figure 3)
0.047
0.6
0.125
Maximum Input Voltage VG1-0 bits = “10”(+12dB)
Pull Down Current
-
A
Video Analog Output (Figure 4)
Output Gain
fin =100kHz
Sine wave Input (Note 19)
VG0 bit = “0”, 0.5Vpp Input
VG0 bit = “1”, 0.3Vpp Input
11.5
12.0
12.5
dB
16.0
-
16.5
50
17.0
100
Clamp Level (Note 19)
S/N (Note 21)
VG1-0 bits = “10”(+12dB)
Maximum Output Voltage
(Note 19)
mV
dB
BW = 100kH 6MHz,
S = 0.35Vpp Input
60
67
-
-
-
fin =100kHz (Sine wave)
2.54
Vpp
dB
Secondary Harmonic Distortion
VG1-0 bits = “10”(+12dB)
fin = 3.58MHz
430mVpp: 20 ~ 100IRE,
Sine Wave Input
(Flat Field = 100 IRE
Burst = 20IRE)
-
45
35
Load Resistance
Load Capacitance
140
150
-
-
45
30
-
15
400
-
C2 (Figure 4)
C3 (Figure 4)
fin = 10kHz
fin = 100kHz
-
-
-
-
pF
pF
dB
dB
PSRR (Note 22)
VG1-0 bits = “10”(+12dB)
-
LPF for VIN signal : (Note 19)
Frequency Response (fin = 100kHz,0.5Vpp, Sine wave Input) , C2 = 15pF, C3 = 400pF
+2.0
20
100
Response at 6.75MHz
Response at 27MHz
|GD3MHzGD6MHz|
3.0
-
-
0.5
47
15
dB
ns
Group Delay
Note 19. Figure 4. のMesurement point 1 の測定点でのスペックです。0.5Vpp入力はVG1-0 bits = “10”(+12dB)時
の値です。入力振幅はゲインに反比例します。S/N, Secondary Harmonic Distortionの測定点は
Measurement point 2になります。
Note 20. VIN pin への入力回路がパワーダウンや、入力信号を停止した時などに、0.075 ~ 1.6kの範囲外にな
る場合、PMV bit を“0”にして下さい。
Note 21. S/N = 20 log (Output Voltage [Vpp]/Noise Level [Vrms]). Output Voltage = 0.7 [Vpp].
Note 22.測定条件は、AVDD に 500mVpp のSin波を印加し、VOUT にて20IRE, 0IRE, 100IRE になるDC を VIN
に印加した場合です。
VIN pin
From Video DAC
AK4958
C1
R1
Figure 3. External Resistor of Video Signal Input pin
Measurement point1
Measurement point 2
75 Ω
Video Signal Output
R3
R2
75 Ω
C2
C3
Figure 4. Load Capacitance C2 and C3
MS1558-J-01-PB
2013/10
- 17 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
